Air-pump



J.LAFRANCE.-

AIR PUMP.

APPLlCATilON FILED MAR. l. 1919.

1,327,833. v Patented Jan. 13,1920.

2 SHEETS-SHEET l- If? J: 155; k j I lnVen/or absqmlavkance UNITED srarusraruur orrroa.

JOSEPH LAFRANCE, OF MONTREAL, QUEBEC, CANADA, ASSIGIFOR 0F ONE-HALF T0ALEXANDRE CHAG-NON, 0F MONTREAL, QUEBEC, CANADA.

AIR-PUMP.

To all whom it may concern:

Be it known that I, JosEPH LAFRANCE, a British subject, residing at 10St. Jerome street, in the city of Montreal, in the Province of Quebec,in the Dominion of Canada, have invented certain new and usefulImprovements in Air-Pumps; and I do here by declare that the followingis a full, clear, and exact description of the same. I

The present invention relates to improvements in air-pumps and the mainob ect is to provide a device of the character which is particularlyadapted to pump automoblle tires; and which will be of simple and cheapconstruction, compact and powerful.

The invention will be understood with the .aid of the accompanyingdrawings in which:

Figure 1 is a side elevation of the pump attached to an automobile footboard and connected to the tire ready for operation.

Fig. 2 is an enlarged side elevation of the pump, a portion of onecylinder being cut away to illustrate the piston which is in section.

Fig. 4 is a side elevation of a modifiedform of the pump.

Fig. 5 is an enlarged longitudinal section through the modified form ofcylinders.

Fig. 6-is a cross section on line A. A. of Fig. 3.

Fig. 7 is a section through the T-coupling illustrating the ball-valve.

Like numerals of reference indicate corresponding parts in each figure,

In the drawings, 1 represents a frame or support having at each endthereof a circular member or head 2 suitably threaded and centrallyperforated, and 3 is a downwardly projecting member provided at itslower end with a pin 4.

5 and 6 are .pipes projecting through the perforated portion in saidcircular members 2 and having at their outer ends pistons, each of whichhas secured thereon a cup packing 8. The inner ends of the pipes 5 and 6are united by a T-coupling 9 in which is provided a valve ball 10. 11 isa lever pivotally mounted at its lower end on the pin 4 and pivotallyconnected intermediate of its length by the pin 12 to the T-coupling 9.13 are cylinders suitably threaded at their inner ends to the circularmembers 2 and 14 are heads threaded on the outer ends matically opens.

Specification of Letters Patent. Patented J an, 13, 1920,

Application filed March 1, 1919. Serial No. 280,184.

of each of said cylinders, each head 14 having an inlet opening which iscontrolled by a suitable valve 44.

On the upper end of the lever "11 is provided a hand lever 15 which ispreferably of suitable length to permit pumping by the and 17 is anoutwardly projecting flange preferably secured on the downwardlyprojecting member 3 and provided with a threaded hole in which threads ascrew 18.

Suitably connected to the T-coupling 9 is an air tube 19'which isadapted to be connected at its outer end to the tire VfllV8.' In theoperation of this pump, when the lever 11 is actuated as indicated indotted lines in Fig. 2, the pistons 7 will be carried to and fro by thepipes 5 and 6, said pipes 5 and 6 communicating with the cylinders Itwill be clearly understood that as one piston moves outward, i. 6.,toward the head 14 of its cylinder, it will compress the thumb air infront of it and force the same to pass into the pipe 5 or 6, and thencethrough the coupling 9 into and through the supply tube 19 to the tire,while at the same time the other piston moves inward toward its cylinderhead 2 and draws air into the cylinder through the inlet 44, which auto-The ball 10 located in the Tcoupling will be forced against the oppositeend of the coupling during "the compression stroke of either piston, tus causing the compressed air to enter the air tube 19.

A modification of the invention is illustrated in Figs. 4 and 5. Themodification consists in the association with each cylinder 13 of anadditional parallel cylinder 20 preferably smaller than the cylinder 13,both cylinders being secured at their outer ends by a head member 21 inwhich latter there is provided a passage 22 connecting the cylindcrs'andalso an inlet valve 44' communicating with cylinder 13. The pistons 7have cu packings 8 but the pipes 5 and 6 are replaced by a solid rod 23and I inder.

24 is a downwardly projecting member preferably secured by any suitablemeans to the T-coupling 25. 26 and 27 are piston rods each of whichprojects through a perforated member 28 or head which covers one end ofthe respective cylinder 20, and 29 is a piston suitably secured to eachpiston rod and provided with a cup packing 30. The

cup packing of this piston 29 is preferably inverted in relation to thepacking 8 in the cylinder 13 so as to. permit the air to pass betweenthe wall of the cylinder 20 during the out stroke of the piston 29. Thepiston rods 26 and 27 are longitudinally perforated to-form a passage 31which communicates at its outer ends at 32 with the cylinders 20. An airtube 33 is connected at one end to said T-coupling 25.

In the operation of this pump, when the lever 11 is operated, thepistons 7 and 29 will be moved to and fro simultaneously, the piston 7during its out-stroke naturally compressing the air in front of it andforcing it through the passage 22 into the .cylinder 20, where it issubjected toa further compression by the smaller piston 29 and escapesbetween the cylinder wall and the packing 30 into the rear portion ofthe cyl- During the succeeding in-stroke of the pistons, the air behindthe piston 29 is again compressed and .forced to' escape through theopening 32 into the passage 31 in the piston rod, whence it passes intoand through the supply tube 33.

What I claim as myinvention is:

' 1. An air pump comprising a frame, two cylinders disposed inlongitudinal relation to one another secured to said frame, a pis ton ineach of said cylinders, a piston rod connecting said pistons, saidpiston rod having an air passage therethrough, an air tube connected tosaid piston rod, a lever for opcrating said piston rod, and means onsaid Witnesses frame whereby the pump may be rigidly secured to anyconvenient part of an. automobile or the like; substantially asdescribed.

2. 'An air pump'comprising a frame having at each end thereof anoutwardly projecting, centrally.perforated'member, a cylinder securedateach end of said frame to the perforated member, a movable piston ineach of said cylinders, a horizontal piston rod passing through each ofsaid centrally perforated members and secured at each end to theadjacent piston, said piston rod being slightly smaller in diameter thanthe 'perforation in'said members and provided with a central air passagecommunicating with each of said cylinders, an air tube connected to saidpiston rod, and a lever fulcrumed on said frame and'lpivotally connectedto said piston rod whereby said piston may be operated simultaneouslysubstantially as described.

3. An air pumpcomprising a frame, a main cylinder secured to said frame,a piston rod in alinement with said cylinder, a piston secured to saidpiston rod adapted to operate in said main cylinder, a secondarycylinder below and in parallel relation to said main cylinder, meansconnecting said cylinders together, a movable piston in said secondarycylinder, a hollow piston rod secured to the second named piston andcommunicating with said secondary cylinder, means rigidly connectingsaid piston rods together, an air tube connected to said hollow pistonrod, and means to move said piston rods to and fro; substantially asdescribed.

,Signed at Montreal, Canada, this 30th day of January, 1919.

- JOSEPH LAFRANOE.

A. P. DEAL, A. DES ROSIERS.

